regerror.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- #include <my_global.h>
- #include <m_string.h>
- #include <m_ctype.h>
- #include "my_regex.h"
- #include "utils.h"
- #include "regerror.ih"
- /*
- = #define REG_NOMATCH 1
- = #define REG_BADPAT 2
- = #define REG_ECOLLATE 3
- = #define REG_ECTYPE 4
- = #define REG_EESCAPE 5
- = #define REG_ESUBREG 6
- = #define REG_EBRACK 7
- = #define REG_EPAREN 8
- = #define REG_EBRACE 9
- = #define REG_BADBR 10
- = #define REG_ERANGE 11
- = #define REG_ESPACE 12
- = #define REG_BADRPT 13
- = #define REG_EMPTY 14
- = #define REG_ASSERT 15
- = #define REG_INVARG 16
- = #define REG_ATOI 255 // convert name to number (!)
- = #define REG_ITOA 0400 // convert number to name (!)
- */
- static struct rerr {
- int code;
- const char *name;
- const char *explain;
- } rerrs[] = {
- {REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match"},
- {REG_BADPAT, "REG_BADPAT", "invalid regular expression"},
- {REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element"},
- {REG_ECTYPE, "REG_ECTYPE", "invalid character class"},
- {REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\)"},
- {REG_ESUBREG, "REG_ESUBREG", "invalid backreference number"},
- {REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced"},
- {REG_EPAREN, "REG_EPAREN", "parentheses not balanced"},
- {REG_EBRACE, "REG_EBRACE", "braces not balanced"},
- {REG_BADBR, "REG_BADBR", "invalid repetition count(s)"},
- {REG_ERANGE, "REG_ERANGE", "invalid character range"},
- {REG_ESPACE, "REG_ESPACE", "out of memory"},
- {REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid"},
- {REG_EMPTY, "REG_EMPTY", "empty (sub)expression"},
- {REG_ASSERT, "REG_ASSERT", ""can't happen" -- you found a bug"},
- {REG_INVARG, "REG_INVARG", "invalid argument to regex routine"},
- {0, "", "*** unknown regexp error code ***"},
- };
- /*
- - regerror - the interface to error numbers
- = extern size_t regerror(int, const regex_t *, char *, size_t);
- */
- /* ARGSUSED */
- size_t
- my_regerror(int errcode, const my_regex_t *preg, char *errbuf, size_t errbuf_size)
- {
- register struct rerr *r;
- register size_t len;
- register int target = errcode &~ REG_ITOA;
- register char *s;
- char convbuf[50];
- if (errcode == REG_ATOI)
- s = regatoi(preg, convbuf);
- else {
- for (r = rerrs; r->code != 0; r++)
- if (r->code == target)
- break;
- if (errcode®_ITOA) {
- if (r->code != 0)
- (void) strcpy(convbuf, r->name);
- else
- sprintf(convbuf, "REG_0x%x", target);
- assert(strlen(convbuf) < sizeof(convbuf));
- s = convbuf;
- } else
- s = (char*) r->explain;
- }
- len = strlen(s) + 1;
- if (errbuf_size > 0) {
- if (errbuf_size > len)
- (void) strcpy(errbuf, s);
- else {
- (void) strncpy(errbuf, s, errbuf_size-1);
- errbuf[errbuf_size-1] = ' ';
- }
- }
- return(len);
- }
- /*
- - regatoi - internal routine to implement REG_ATOI
- == static char *regatoi(const regex_t *preg, char *localbuf);
- */
- static char *
- regatoi(preg, localbuf)
- const my_regex_t *preg;
- char *localbuf;
- {
- register struct rerr *r;
- for (r = rerrs; r->code != 0; r++)
- if (strcmp(r->name, preg->re_endp) == 0)
- break;
- if (r->code == 0)
- return((char*) "0");
- sprintf(localbuf, "%d", r->code);
- return(localbuf);
- }